Spectroscopy of Magnetic Excitations in Magnetic Superconductors Using Vortex Motion

TL;DR

This paper investigates how vortex motion in magnetic superconductors can generate spin waves, leading to observable peaks in I-V characteristics at resonance conditions, revealing interactions between vortices and magnetic excitations.

Contribution

It demonstrates the conditions under which vortex-induced spin wave resonances produce detectable signals in layered magnetic superconductors.

Findings

Resonance peaks occur when vortex lattice frequency matches spin wave frequency.

Peaks are observable in borocarbides and cuprate layered magnetic superconductors.

Strong peaks can be detected over quasiparticle background when conditions are met.

Abstract

In magnetic superconductors a moving vortex lattice is accompanied by an ac magnetic field which leads to the generation of spin waves. At resonance conditions the dynamics of vortices in magnetic superconductors changes drastically, resulting in strong peaks in the dc I-V characteristics at voltages at which the washboard frequency of vortex lattice matches the spin wave frequency $\omega_s({\bf g})$, where ${\bf g}$ are the reciprocal vortex lattice vectors. We show that if washboard frequency lies above the magnetic gap, peaks in the I-V characteristics in borocarbides and cuprate layered magnetic superconductors are strong enough to be observed over the background determined by the quasiparticles.